astro 2.3.3

#6940 a98df9374 Thanks @delucis! - Support custom 404s added via injectRoute or as src/pages/404.html
#6948 50975f2ea Thanks @imchell! - Placeholders for slots are cleaned in HTML String that is rendered
#6848 ebae1eaf8 Thanks @Princesseuh! - Update experimental.assets's image.service configuration to allow for a config option in addition to an entrypoint
#6953 dc062f669 Thanks @Princesseuh! - Update astro check to use version 1.0.0 of the Astro language server
Updated dependencies [ac57b5549]:
- @astrojs/telemetry@2.1.1
- @astrojs/webapi@2.1.1